This chart of what fish are in which lakes used to be on the NPS site, but apparently no longer is. There's been some questions about it's accuracy, but on the whole has seemed pretty consistent with reports.

Pumpkinseed is basically a blue gill. Typically they are more green and have a red/black spot on their gill cover instead of a blue/black one like blue gills. You've almost certainly caught one before and not realized it if you fished blue gills before.